Can you post the log on C:\Users\butte\AppData\Roaming\Unreal Engine\AutomationTool\Logs\E+Program+Files+Epic+Games+UE_4.18\UAT_Log.txt
also it seems it is complaining about some warnings:
UATHelper: Packaging (Android (ETC2)): C:\NVPACK\android-sdk-windows\tools\ant\build.xml:871: Please correct the above warnings first.